Change List for this Rule


General Order 95


Section V


Detailed Construction Requirements for Supply Lines
(Class H, L and T Circuits)


52.7    Hardware

A.    Protection against Corrosion (See Rule 49.8 )


B.    Metal Braces


(1)    For Wood Crossarms: Metal crossarm braces on wood crossarms shall be not less than 1–1/2 inches from lead wires, ground wires, and bond wires (except as provided in Rule 53.4 ), metal pins and other insulator hardware, switch and cutout hardware, conduits and fittings of riser cables and cable runs, and metal braces which extend to a crossarm at another conductor level; except that on wood crossarms supporting conductors of only one circuit of more than 7,500 volts, metal crossarm braces may contact bond wires, metal pins and other insulator hardware where such contact is intentionally and securely made and the lower extremity of such metal braces is not less than 3 feet above the next conductor level below such braces.

Metal crossarm braces attached to wood arms shall clear transformer cases and hangers by not less than 1 inch of air space and by not less than 1 1/2 inches of creepage distance along wood or insulating surfaces.

(2)    For Metal Crossarms: The lower extremities of metal crossarm braces attached to metal crossarms on wood poles shall be not less than 3 feet above the next conductor level below such braces. See Rule 52.5 for the grounding of metal arms.


C.    Separation from Bond Wires and Ground Wires

Bond wires and ground wires shall have a clearance of not less than 1–1/2 inches from metal pins, bolts, and other hardware on wood crossarms and wood poles except where the hardware is intended to be connected to the bond or ground wires, and in being so connected does not violate other rules of this Order, in which case suitable electrical contact shall be made.


Note:    Revised March 9, 1988 by Resolution E–3076.


D.    Separation from Metal Pins and Deadend Hardware

Through bolts, metal signs, conduits, metal braces, mounting bolts and hardware for cutouts or other apparatus, metal street light fixtures, metal pole top extensions and metal arm extensions supported by or attached to the surface of wood poles and wood crossarms shall have a clearance of not less than 1–1/2 inches from metal pins and deadend hardware. Bolts and hardware of line equipment and bolts and hardware of insulators, all of which are associated with the same circuit and on the same crossarm, may be metallically interconnected provided a positive electric contact is made.

Any guy contacting or connected to a metal pin or part of deadend hardware shall not be placed in the climbing space. No part of any guy may be nearer than 1 1/2 inches to any through bolt which is metallically interconnected to dead–end hardware.


Note:    Revised September 18, 1967 by Decision No. 72984, March 9, 1988 by Resolution E–3076 and May 22, 1990 by Resolution SU–5.


E.    Metal Back Braces

The use of metal back braces is not recommended (see
Rule 54.7–A3 for climbing space requirements).


F.    Grounded (See Rule 54.4–G )


Note:    Revised January 21, 1992, by Resolution SU–10 and eliminated January 19, 1994 by Resolution SU–25.